A wire can be voltage-rated and still be illegal. In this video, I explain why NEC 300.22(C) restricts wiring methods in plenum spaces, how HVAC air movement turns smoke into a life-safety hazard, and why plenum-rated insulation is required even when electrical performance is identical. In a fire, smoke spreads faster than flames. Follow NEC Plug for NEC rules explained simply and correctly. ⚡️🔌 #electrician #NEC #neccode #electricity #residentialelectrician
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